Tysabri screening concerns

A paper in the New England Journal of Medicine questions the accuracy of the test for the JC virus in people taking Tysabri. From a small sample, researchers identified 17 people who had been exposed to the virus when checking for both JCV antibodies and DNA. Six of these had shown as free of the virus when checked for JCV antibodies alone (the standard test). MedPage Today Natalizumab (Tysabri) - A to Z of MS
Source: Multiple Sclerosis Trust - Category: Neurology Source Type: news